<template>
    <div class="star" :class="'star-'+size">
        <span class="star-item" v-for="(sc,index) in starClasses" :class="sc" :key="index"></span>
    </div>
</template>

<script>
    const CLASS_ON='on' //完整黄星
    const CLASS_HALF='half' //半颗黄星
    const CLASS_OFF='off' //灰星
    export default {
        name: "Star",
        props:{
            score:Number, //评分
            size:Number //星星大小
        },
        computed:{
            starClasses(){
                const {score}=this
                const scs=[]
                //向css中添加n个CLASS_ON
                const scoreInteger=Math.floor(score) //评分向下取整获得整星数量
                for (let i=0;i<scoreInteger;i++){
                    scs.push(CLASS_ON)
                }
                //向css中添加0/1个CLASS_HALF
                if (score*10-scoreInteger*10>=5){
                    scs.push(CLASS_HALF)
                }
                //向css中添加n个CLASS_OFF
                while (scs.length<5){
                    scs.push(CLASS_OFF)
                }
                return scs
            }
        }
    }
</script>

<style lang="stylus" scoped>
    @import "../../common/stylus/mixins.styl"
    .star //2x图 3x图
        float left
        font-size 0
        .star-item
            display inline-block
            background-repeat no-repeat
        &.star-48
            .star-item
                width 20px
                height 20px
                margin-right 22px
                background-size 20px 20px
                &:last-child
                    margin-right: 0
                &.on
                    bg-image('./images/star48_on')
                &.half
                    bg-image('./images/star48_half')
                &.off
                    bg-image('./images/star48_off')
        &.star-36
            .star-item
                width 15px
                height 15px
                margin-right 6px
                background-size 15px 15px
                &:last-child
                    margin-right 0
                &.on
                    bg-image('./images/star36_on')
                &.half
                    bg-image('./images/star36_half')
                &.off
                    bg-image('./images/star36_off')
        &.star-24
            .star-item
                width 10px
                height 10px
                margin-right 3px
                background-size 10px 10px
                &:last-child
                    margin-right 0
                &.on
                    bg-image('./images/star24_on')
                &.half
                    bg-image('./images/star24_half')
                &.off
                    bg-image('./images/star24_off')
</style>